var ser_hide=document.getElementById('ser_hide')
var text=document.getElementById('text')
var btn=document.getElementById('btn')
	text.onfocus=function(){
		ser_hide.style.display="block"
		btn.style.display="none"
	}
	text.onblur=function(){
		ser_hide.style.display="none"
		btn.style.display="block"

	}